The periglacial of Massif Juneau in Alaska
DOI:
https://doi.org/10.26485/BP/1964/13/1Keywords:
periglacial processes, congelifluction, slope deposits, glacial formsAbstract
Article in French.
ORIGINAL TITLE: Le periglaciaire du Massif Juneau en Alaska
Periglacial processes are determined by the state of pre-periglacial relief, current glaciation, duration of local deglaciation, altitude, heavy snowfall, summer thermal regime, lithological differences, and granulometric values. In the studied massif, on steep sections, frost processes (freezing, disintegration, weathering), rapid scouring, and denudation dominate; whereas on lower-slope sections, the most active mechanisms are nivation and congelifluction. The influence of stratal flow, and wind is weak. On the outer boundaries of the massif, processes associated with meltwater, pluvial and glacial waters, as well as slope processes, dominate. Within the Juneau Ice-field, the formation of nunataks, cirques, or niches (mixed glacial and periglacial forms), boulder fields, slope formations, and the formation of supraglacial lakes are best represented. Compared to the periglacial region of the American Arctic, the periglacial region of the Juneau Massif is less diverse and has a limited extent.
References
Black, R.F 1960 - Ice wedges in Northern Alaska. Abstracts of Papers, XIX Int. Geogr Congress, Stockholm 1960; p. 26.
Corbel, J. 1958 - Climats et morphologie dans la cordillère canadienne. Revue Canadienne de Geogr., vol. 12; pp. 15-46.
Eakin, H.M. 1913 - The Yukon-koyukuk region, Alaska. U. S. Geol. Surv., Bull,
Hamelin, L.E. 1961 - Périglaciaire du Canada: Idées nouvelles et perspectives globales. Cahiers de Geogr. de Québec; pp. 141-205.
Hamelin, L.E., Clibbon, P. 1962 - Vocabulaire périglaciaire bilingue (français et anglais). Cahiers de Geogr. de Quebec; pp. 201-227.
Jahn, A. 1961 - Geographical problems of Alaska in the light of a research journey made in 1960. Czasopismo Geogr., t. 32; pp. 3-54.
Kerr, F. A., Cooke, H. C. 1948 - Taku river map-area, British Columbia. Geol. Survey, Mem. 248, Ottawa; pp. 17-18.
Lliboutry, L. 1960 - L'érosion glaciaire. Aish, no 59, Commission of Land Erosion; p. 222.
Miller, M. M. 1961 - The distribution study of abandoned cirques in the Alaska-Canada Boundary Range. Geology of the Arctic, Toronto; pp. 833-848.
Péwé, T. L. 1954 - Effect of permafrost on cultivated fields, Fairbanks area, Alaska. Geol. Surv. Bull., 989f; pp. 314-351
Veyret, P. 1959 - L'eau, la neige, la glace, le gel et la structure dans l'evolution morphologique de la region de Chamonix· (massif du Mont Blanc et des Aiguilles Rouges). Revue de Geogr. Alpine, t. 47; pp. 5-37.
